Technicolor TB30, Administrator'S Manual

Page: 251 / 266

TB30s SIP Administrator Guide v1.3
Page 244 of 259
TR-111 support with TB30
About TR-111
The TR-111 standard defines two ways of managing CPE located behind NAT routers. These CPE
cannot be contacted directly using HTTP because they are not exposed to the Internet. In many cases
the periodic inform interval6 is set to 24 hours or more. With TR-111 Parts I and II the DSL Broadband
Forum defines two ways of enabling the server to contact these devices anyway.
TR-111 Part I: Device Gateway Association
The first method is to associate the phone with the modem or router it is connected to. This
association is communicated to the ACS in the Inform message sent by the phone. The ACS creates port-
forwarding rules on the router, which enable the ACS to contact the phone. Figure 6 shows the process
of associating the phone with the router.
TR111 is supported for TB30. It aims at the CPE which is behind a NAT. ASC can initiate the
connection to CPE. It is through 125 option in DHCPINFORM/DHCPDISCOVER/DHCPREQUEST to
exchange the information with IGD.
Device Gateway Association
The DISCOVER request contains DHCP Option 125 with sub-options 1,2 and 3 set the respective CPE
values. The DHCP OFFER response. Contains the DHCP Option 125 with sub-options 4,5 and 6 set to the
respective Gateway Device options. The CPE is required to set the correct values for the following TR-069
parameters and send them in the Inform request.
TR-111 Part II: Connection request via NAT gateway
TR-111 Part II specifies a way of communicating the current NAT binding to the ACS. This method is
similar to STUN.